General Physics 2 Quiz 3 (MOD 3)

When light travelling in a certain medium falls on the surface of another medium, a part of it turns back in the same medium. This phenomenon is called

• refraction

• reflection

• defraction

• scattering

The size of the image is always smaller than the object in

• plane mirror

• silver mirror

• concave mirror

• convex mirror

When a ray of light enters from denser medium to rare medium it bends

• away from normal

• towards normal

• perpendicular to normal

• parallel to normal

The critical angle of water when refracted angle is 90 ° and refractive index for water and air is 1.33 and 1 is

• 48.8 °

• 49.1 °

• 50 °

• 51 °

One reason why the sky appears blue is because:

• Much more red light than blue light is absorbed by air atoms.

• Red light is reflected by the atmosphere.

• Red light is reflected by the atmosphere.

• Blue light is scattered to a greater extent than red light.

The law of reflection applies to

• a. only partially reflected waves.

• b. only totally reflected waves.

• c. only normal waves.

• d. both partially and totally reflected waves.

When light incident on a prism separates into a spectrum, we call the process

• a. reflection.

• b. interference.

• c. diffraction.

• d. dispersion.

The critical angle in total internal reflection occurs when incident light on a surface is

• a. refracted at 90° to the normal.

• b. reflected at 90° to the normal.

• c. at maximum diffraction.

• d. totally absorbed.

The critical angle of water when the refracted angle is 900 and refractive index of water and air is 1.33 and is

• 48.8⁰

• 49.1⁰

• 50⁰

• 51⁰

In a concave mirror, the size of the image depends upon

• Size of the object

• Position of object

• Area covered by an object

• Shape of object